20.7.1-amd64 wireguard does not start anymore

[ednt]

I just updated opnsense from 20.1.9 to 20.7.1.
Wireguard is not starting anymore.

If I try to start it 'by hand' with

wireguard-go /usr/local/etc/wireguard/wg0.conf

I can see:

INFO: (/usr/local/etc/wireguard/wg0.conf) 2020/08/29 21:30:04 Starting wireguard-go version 0.0.20200320
ERROR: (/usr/local/etc/wireguard/wg0.conf) 2020/08/29 21:30:04 Failed to create TUN device: interface name too long

Isn't the interface name wg0 ???

There is no wg0 interface available.

I tested also

wg-quick up /usr/local/etc/wireguard/wg0.conf

It shows no errors, but wireguard is not running.

Any ideas?


I found some entries in the 'general' log:

2020-08-29T22:00:15   kernel   wg0: link state changed to DOWN
2020-08-29T22:00:15   kernel   wg0: deletion failed: 3
2020-08-29T22:00:15   kernel   tun0: changing name to 'wg0'
2020-08-29T22:00:15   kernel   tun0: link state changed to UP

But nothing else.

[danielm]

Do you have it configured through the web gui, or manual config file editing?
On my end, it's working fine since 20.1.x, interface name still being wg0, but I think on upgrading I had to restart the box once or twice for wg to continue working.
Also, make sure that you don't have the wg0, or whatever it is on your end, interface assigned and activated in the web gui.
This somehow breaks the auto config that wg does.
AFAIK you can have it assigned in the interface assignment, you can even give it a name, but you can't activate it.
At least that's how it is for me.

[ednt]

I did the whole configuration via the web GUI already with 20.1.7
And it was working fine since this moment.

Only the update to 20.7.1 resuts in a non starting wireguard.

There is no 'own' intergface wg0 in the GUI.

[danielm]

Maybe try restarting the FW once or twice more, something changed with the interfaces on 20.7 which caused problems for my wireguard too, but restarting fixed the problem. And make sure you don't accidentally have the wireguard interface enabled.
Can you still list the wireguard configuration from the plugin page? What does it say? Is the config still intact?

[ednt]

I started it already several times via the dashboard.
I also enabled and disabled wireguard several times.

The configuration is shown correctly. (like in 20.1.7 ... 9)

There is no interface wg0 or any other from wireguard in the interface section.

[danielm]

To be clear I meant restarting the firewall as a whole, which you can't do through the dashboard, just FYI if you misunderstood me.
If nothing works, it might be the easiest to delete the config and reinstall wireguard TBH, which should hopefully work if nothing is borked beyond repair.

[ednt]

I can not reboot the firewall, it is not my own, it is from a company.

Also I think it's the wrong way to find the fault.
Because if a working configuration does not worl anymoe after an upgrade, something with the upgrade is not correct. You can not tell every opnsense user delete all your configurations and set it up from scratch.
That's not an upgrade, that's a new installation with a new configuration.

The goal is to make the upgrade seamless.
If this is not working, the fault has to be fixed.
But for that the fault has to be found.

So I will try now to get more/better error messages.

[ednt]

Btw. the above command to start wireguard manually was wrong.

I found now the right way:

Code Select Expand


wg-quick up /usr/local/etc/wireguard/wg0.conf
[#] wireguard-go wg0
INFO: (wg0) 2020/08/31 10:00:50 Starting wireguard-go version 0.0.20200320
[#] wg setconf wg0 /tmp/tmp.5I1EPWFN/sh-np.VQ8fnM
[#] ifconfig wg0 inet 10.10.254.252/24 10.10.254.252 alias
[#] ifconfig wg0 mtu 1420
[#] ifconfig wg0 up
[#] route -q -n add -inet 10.10.254.8/32 -interface wg0
[#] route -q -n add -inet 10.10.254.46/32 -interface wg0
[#] route -q -n add -inet 10.10.254.45/32 -interface wg0
[#] route -q -n add -inet 10.10.254.4/32 -interface wg0
[#] route -q -n add -inet 10.10.254.3/32 -interface wg0
[#] route -q -n add -inet 10.10.254.2/32 -interface wg0
[#] route -q -n add -inet 10.10.254.1/32 -interface wg0
[#] route -q -n add -inet 192.168.18.0/24 -interface wg0
[#] rm -f /var/run/wireguard/wg0.sock

But there appears no error.
But I can also not see to which real interface this should be 'bind'

[ednt]

Btw. it is very interesting that the mtu is set to 1420.
Even if I enable advanced at 'Edit local configuration' the mtu field stays empty and as hint it is written that the mtu of the main interface is used, which is 1500.

[danielm]

I suggested a reboot because it fixed the issue for me, not because it is some kind of fix for a bug in the upgrade process, which is probably there since multiple users are affected.
If there is no possibility to reboot the system, good luck with future upgrades because I for one have experienced issues like this multiple times in the past, sometimes even after config changes w/o software upgrade.
Also, people on the forums are usually looking for ways to work around issues present on current versions, because the fixed version isn't out yet. That is why I suggested it.
Looking for the root cause might take you days/weeks and possibly require you to inspect the source code (while your production system is down).
On top of that, maybe the issue is not the main upgrade, but simultaneous upgrade of wg, in which case the core team wouldn't even be of much help probably.

BTW, MTU 1420 isn't surprising since wg has a protocol overhead of nearly 80 bytes worst case, so most ppl would just configure 1420, especially considering DSL PPPoE MTU of 1492

[mimugmail]

• route -q -n add -inet 192.168.18.0/24 -interface wg0
  
  
  Let me guess .. this is your LAN?

[ednt]

Yes, that the LAN interface.

But in the configuration of wireguard, this addresses are only available as allowed ip address at the endpoints.
Not all networks allewd networks are visible as route.
And there is nothing changed at the configuration.
But I'll try now to change the order of the addresses, that always the 10... is the first allowed address.
Maybe it helps.

[ednt]

The order in the wg0.conf file changes nothing.
I also see no web gui field where it is possible to set the real interface.

[ednt]

Btw. I just switched to the slave OPNsense and rebootet the master:

Still the same: wireguard is not starting.

[ednt]

If I disable all endpoints in OPNsense, wireguard starts.

If I enable one enpoint with only the 10. address allowed, it also works.
But as expected, I can not access our LAN.
If I add the LAN address as allowed IP address, wireguard does not start anymore.